不同成因类型煤型气地球化学特征及其判识意义

鲍园; 韦重韬; 王超勇

doi:10.3799/dqkx.2013.101

Volume 38 Issue 5

Sep. 2013

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Article Navigation > Earth Science > 2013 > 38(5): 1037-1046

BAO Yuan, WEI Chong-tao, WANG Chao-yong, 2013. Geochemical Characteristics and Identification Significance of Coal Type Gas in Various Geneses. Earth Science, 38(5): 1037-1046. doi: 10.3799/dqkx.2013.101

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BAO Yuan, WEI Chong-tao, WANG Chao-yong, 2013. Geochemical Characteristics and Identification Significance of Coal Type Gas in Various Geneses. Earth Science, 38(5): 1037-1046. doi: 10.3799/dqkx.2013.101

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Geochemical Characteristics and Identification Significance of Coal Type Gas in Various Geneses

doi: 10.3799/dqkx.2013.101

BAO Yuan^{1, 2, 3
,},
WEI Chong-tao^{2, 3},
WANG Chao-yong^{2, 3}

1.
Key Lab of Computational Geodynamics, CAS, College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China
2.
Key Laboratory of CBM Resource and Reservoir-Generating Process of Ministry of Education, Xuzhou 221008, China
3.
School of Resources and Earth Science, China University of Mining and Technology, Xuzhou 221008, China

Received Date: 2012-08-22
Publish Date: 2013-09-15

Abstract

Abstract

Based on the statistic study of 324 groups of published coal type gas geochemical data from 21 basins or areas from all over the world, stratigraphic distribution, stable carbon and hydrogen isotopic composition, and spatial distribution of coal type gas in various genesis are analyzed. Multiple charts for identifying the genetic types of coal type gas are established. And the feasibility of these charts is demonstrated by an example. The results show that biogenic gases that generated from coal seam are not the same as normal biogas (compared with normal gas). The most significant difference is the δ¹³C(CH₄) value of microbial gases lower than that of normal biogas. The stable isotopic composition of microbial gases fall within the following ranges: δ¹³C(CH₄) < -60‰, while for thermogenic gases, δ¹³C(CH₄) > -40‰. And for mixed gases, δ¹³C(CH₄) ranges from -60‰ to -40‰. There is a tendency that from biogenic gases to thermogenic gases, δ¹³C(CH₄), δ¹³C(CO₂-CH₄), δ¹³C(C₂H₆-CH₄), and CH₄/(C₂H₆+C₃H₈) gradually become heavier with the increase of the maturity of organic matter. An obvious positive correlation exists among aforementioned parameters. It is concluded that the charts of δ¹³C(CH₄) and δ¹³C(CO₂-CH₄), δ¹³C(CH₄) and δ¹³C(C₂H₆-CH₄), and δ¹³C(CH₄) and CH₄/(C₂H₆+C₃H₈) are the most reliable charts for classifying the genetic type of coal type gas.
- coal type gas,
- biogenic gas,
- thermogenic gas,
- isotopic composition,
- genetic types,
- geochemistry

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References(73)

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Geochemical Characteristics and Identification Significance of Coal Type Gas in Various Geneses

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